Automatic draft operator for furnaces



Nov. 18, 1941. A. F. H. WEISS I AUTOMATIC DRAFT OPERATOR FOR FURNACES Filed NOV. 21, 1939 2 Sheets-Sheet 1 I flrthurEEWe ATTORNEYS N 1941- A. F. H. WEI SS AUTOMATIC DRAFT OPERATOR FOR FURNACES Filed Nov. 21, 1939 2 Sheets-Sheet 2 INVENTOR *m on 0 ATTORNEYS Patented Nov. 18, 1941 I line 5 of Figure 4.

applied or connected thereto.

; UNITED STATES PATENT}OFFICE- AUTOMATIC DRAFT OPERATOR FO R A FURNACES 7 Arthur F. n. Weiss, Irving ton, N. J. n

Application'November 21, 1939, Serial No. 30 5,535 (Cl.16l-,-i A operation thereby in the usualmanrien The My invention relates to an automatic draft operator for furnaces and has as one of the principal objects thereof theprovision of an ape paratus so constructed and arranged as to operate the various drafts on a furnace at a predetermined period whereby drafts as desired. n

Another object of my invention is to provide a device of the above described character which is simple in construction, durablein use, efficient in operation, easy ofinstallation, economical in manufacture, and capable of being attached to furnaces already in use without modifying the same.

Other objects and advantages will be apparent from the following description, appended claims and annexed drawings. j

Referring to the drawings wherein like refer ence characters designate the several views:

like parts throughout to open or close said Figure 1 is a front elevation of a furnacei l- I lustrating my invention as applied thereto.

Figure 2 is an enlarged side elevationof a portion of the apparatus.

of the weight supports.

Figure 5 is a detail sectional view taken onthe Figure 6 is a side elevation of the upper pore tion of the furnacedisclosed in Figure 1 and illustrating the manner in which my invention is In practicing my invention, as illustrated in the drawings, I employ a support orshelf 5 arranged in proximity to a furnace or boiler 6; the latter being of an ordinary construction and provided with the usual flue, ash pit and fire box dampers 1, 8 and 9 respectively. The upper portion of the furnace 6 is formed with a smoke dome or passage to having a rearwardly extending section 6b connectedto the end of a smoke pipe 1a constituting the flue and in which is mountedtheflue damper I.

The ash pit damper 8 is of the pivot type and controls the opening through the ash door in the usual manner. The ash pit damper B is provided on the exterior thereof with a laterally extending arm ID for operating the same and the outer end of 'saidarm has connected thereto the lower end of a regulating chain II. The upper end of the chain l I is detachably connected tothe front end of an arm 12, the latter being pivotally connected between its ends to a thermostat T for rear end of thej arm l2 has-connecte d thereto the upperend of a chain I'ZcLfthe lower end of which is connectedto as en door so pivotally mounted on the rear section 6b of the domefia for controlling the draft opening in the sec- Itis to be understood that the thermostat and associated parts heretoforre desoribedare ofwan lower end of a' 'cable litrained'through a "screw eye l5 secured in-theuppen face of a support positioned adjacent the'boiler'li. The upperi'section of the cable 14 is trained through a pair of screw eyes jl6 and with the upper endconnected to the eyed end of a pair of weights I T supported on a deck I8, one endof the latter beinghing'ed to a support bracket I9 or the like securedto, the

rafter ofthe ceiling above theboiler 6;- .Thejop positeuendof the deck [8 isnormallymaintained' in raised position through the medium-of a seat or projection formed on theilower end of a lever 20 pivoted tothe support bracket IQJatoneend thereof. l 1 1 f Thelower end. of the lever20 is engaged by a spring 2inormally urging said lever into .sup.- porting engagement with the deck 18. Obviously,

pivoted motion imparted tothe lever 1 serves to permit downward movement of the, deck. I 8 and consequent lowering of -the weights l1 for a purpose hereinafter more mny set forth.- The weights '11 serves to effect raising of the lower ends of the cables! and 22 and a consequent operation of the dampers 8 and 9. Adjacent the bracket [9 is a similar bracket 24 mounted ofn the rafter and having hinged thereto adeck '25 normally supported in raised position by means of a lever 25 of a like construction and operation as the lever 20.

Mounted on the deck 25is a weight 21 having attached to the eyed end thereof the upper end of a cable 28 trained through a pair of screw'eyes 29. The lowerend of the cable 28 is connected to the operating arm l3 of the damper The has connected thereto; by means of a hook, the

upper ends of the levers 26 and 26 have connected thereto the upper end of an operating cable 30 trained through a screw eye 3| secured in the rafter and the lower end of said cable 30 is connected to the eyed end of a weight 32 mounted on one end of a platform 33, the latter being pivoted between its ends to the upper end of a support 34 fixed to one end of the shelf 5.

The opposite endof the platform 33 normally engages the hooked end 35 of a bell crank lever 36. The opposite end of the bell crank lever 36 has connected thereto the lower end of a cable 31'trained through a screw eye 38 secured to the shelf 5. Between the ends thereof, the shelf 5 is provided with a support S of an inverted L- shaped configuration having secured thereto a screw eye 39 through which is trained the upper end of the cable 31. Said upper end of the cable 31 is connected to the cross piece 40 integrally fashioned on the ends of a pair of spaced arms 4|. The opposite or lower ends of said arms 4| are coiled and secured to a plate 42 fixed to the vertical section of the support S. The coil sections of the arms 4| constitute coil springs for urging the cross piece outwardly and away from the plate 42. The upper end of the plate 42 has pivoted thereto an arm 43 normally overlying and engaging the cross piece 402 p The lower end of the arm 43 is provided with aslot 44 through which extends a downwardly and outwardly inclined end section of a bell crank lever 45, the opposite end of which is fixed to a slide 46 extending through the lower end of the plate and vertical section of the support S as clearly illustrated in Figure 2 of the drawings. The inclined end section of the bell crank lever 45 serves to maintain the arm 43 in overlying relation with the cross piece 40 and against the tension of the coil springs on the ends of the arms 4|, therebyprecluding outward movement of said arms.

The opposite end of the slide 46 has connected thereto one end of a cable 41 which is trained through the eye of a support 48 'securedto the shelf 5. The opposite end of the cable 41 is connected to the hammer 49 of an alarm clock 50 from which the bell has been removed. Said alarm clock 5!] hassecured thereabout a strap 5|, the ends of which are secured by means of bolts or the like 52 to said shelf. Obviously, when the hammer of the alarm clock is operated it serves to effect operation of the bell crank lever 45 through the medium of the cable 41 and slide 46, thereby releasing the lower end of the arm 43 and permitting outward movement of the arms 4|. Outward movement of the arms 4| serves to operate the bell crank lever 36 through the medium of the cable 31 and this operation effects disengagement of the hooked end 35 of the bell crank lever from .the end of the platform 33. .Upon the end of the platform 33 being disengaged from the bell crank lever 36 said platform is pivoted in a manner to discharge the weight 32 downwardly, effecting operation of the cable 30. Operation of the cable 3|] serves to operate the levers 20 and 26 and subsequent operation of the decks l8 and 25, heretofore described.

From the foregoing it will be apparent that when the device is set and operated in the foregoing manner the various drafts of the furnace may be operated at a predetermined period for raising or increasing the temperature of the fire in the boiler.

It is obvious that the invention is not confined to the herein described use therefor as it may be utilized for any purpose to which it is adaptable. It is therefore to be understood that the invention is not limited to the specific construction as illustrated and described, as the same is I only illustrative of the principles of operation, which are capable of extended application in advance forms, and that the invention comprehends all construction within the scope of the appended claims.

What I claim is:

1. The combination with a heater provided with draft-controlling dampers, of a clock mechanism having a swinging hammer, an operating spring, means for releasably holding the said spring in retracted inoperative position, means connected with the hammer and engageable with the spring holding means for releasing the spring upon operation of the hammer, a pivoted support member, a controlling weight mounted on the said support member, a pivoted latch for releasably holding the support member in weight supporting arrangement, a flexible element connecting the latch with the operating spring for releasing the latch when the spring is released, a plurality of weights attached to the heater dampers for operating the same, a pair of pivoted members releasably held in position to support the said weights, and means for releasing the said damper actuating weights upon release of the controlling weight.

2. In combination with a heater having a plurality of draft controlling dampers, a flexible operating element connected to each of the dampers, an auxiliary weight attached to each of the flexible elements and adapted to open the dampers upon release of the weights, a pair of pivoted support members for supporting the auxiliary weights in damper closure positions, lever elements for releasably supporting the pivoted members in elevated weight supporting arrangement, a main weight connected with the said lever elements to actuate the latter for releasing the pivoted members when the said main weight is released, a pivoted member operable to support the main weight, a pivoted latch member for releasably holding the last mentioned pivoted member in weight supporting position, an operating spring connected with the latch member for swinging the latter to main weight releasing position, means for releasably holding the operating spring in retracted position, a clock mechanism having a swinging hammer, and mechanism connected with the said hammer and with the spring holding means for releasably maintaining the latter in spring retracting position.

ARTHUR F. H. WEISS. 

